.pg-tab {
  width: 500px;
  height: 500px;
  border: 1px solid black;
  transition: opacity 0.1;
}

.pg-tab .pg-nav {
  height: 50px;
  border-bottom: 1px solid black;
}

.pg-tab .pg-nav .nav-item {
  float: left;
  line-height: 50px;
  text-align: center;
}

.pg-tab .pg-nav .nav-item.current {
  background-color: black;
  color: white;
}

.pg-tab .pg-page {
  position: relative;
  width: 100%;
  height: 450px;
}

.pg-tab .pg-page .page-item {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  line-height: 450px;
}

.pg-tab .pg-page .page-item.current {
  display: block;
}
